Portable Device Ketone Sensor Integration
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Solution Overview
Problem
Existing portable electronic devices lack an integrated, compact, and accurate ketone analyzer capable of detecting acetone in breath samples without external tubes, which limits their usability for general-purpose applications such as health monitoring and fitness analysis.
Innovation Solution
A portable electronic device with integrated metal oxide gas sensors, specifically tungsten oxide sensors, and a control circuit on a common substrate, housed within a small air duct, along with a compensator for dilution correction, allowing for tubeless breath analysis and accurate ketone detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a specialized breath ketone analyzer is used, then accurate ketone detection is achieved, but the device size and complexity increase, making it unsuitable for integration into general-purpose portable devices
Solution Approach 1:
The patent combines the breath ketone analyzer functionality with a general-purpose portable device (mobile phone or tablet). The sensor module is integrated into the device housing, allowing the specialized analytical function to be merged with a multi-purpose platform, thereby reducing overall system complexity while maintaining detection accuracy.
Solution Approach 2:
The sensor module is nested within the housing of the portable device. The air duct is integrated into the device structure, and the sensor is positioned within the duct, creating a nested configuration where the specialized analyzer components are contained within the general-purpose device architecture.
2Ease of operation
If external tubes are connected to the device for breath sampling, then breath analysis is enabled, but the device becomes less user-friendly and more difficult to integrate into portable form factors
Solution Approach 1:
The patent eliminates the need for external tubes by integrating the breath sampling function directly into the device housing. The air duct is formed as an integral part of the housing structure, extracting the sampling function from external components and embedding it within the device itself, thereby improving ease of operation.
Solution Approach 2:
The device housing itself serves as the breath sampling system. The air duct is formed from the housing structure, and the opening in the housing directly allows breath entry, enabling the device to perform the sampling function autonomously without requiring external tube connections.
3Productivity
If the opening area for breath sampling is increased, then breath flow is improved, but diffusion of surrounding air increases, reducing measurement accuracy
Solution Approach 1:
The patent optimizes the opening area parameter to a specific range that balances breath sampling efficiency with measurement accuracy. The opening is sized to allow sufficient breath flow while limiting the diffusion of surrounding air, representing an optimized parameter selection that resolves the contradiction between productivity and precision.
4Volume of moving object
If the sensor and control circuit are integrated onto a common substrate, then device size is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent integrates the control circuit directly onto the sensor substrate, merging two previously separate components into a single integrated module. This reduces the overall sensor module size and simplifies the system architecture, while the common substrate approach facilitates manufacturing by reducing assembly steps.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables compact, accurate, and user-friendly ketone detection within portable devices, facilitating health monitoring and fitness analysis by providing real-time data on metabolic ketosis and fat burning without external tubes, improving measurement accuracy through compensation for dilution and geometric constraints.
Implementation Method 1
the sensor comprises at least one metal oxide gas sensor... sensitive to ketones, particularly acetone, within a breath sample
Implementation Method 2
metal oxide gas sensor includes preferably tungsten oxide W03 and even more preferably silicon doped tungsten oxide Si:W03
Implementation Method 3
with the total area of the opening being sufficiently small to act as restriction to diffusion, i.e. less than 10 square millimeters
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3
AI summary
A portable electronic device (10) is described with telecommunication capabilities to allow for data and/or voice communication via private or public networks, having an integrated chemical sensor (12) sensitive to ketones within a breath sample of a user wherein the sensor comprises at least one metal oxide gas sensor and a control circuit for the sensor integrated onto a common substrate (24) or package.